John,
In your VFP app, check to see if the file exists, if so open the file in your app using FOPEN(). Then read the content(s) into a variable using FGETS() or FREAD() and depending upon the value of the variable and if FGETS() or FREAD() read any bytes (verifying that the file isn't empty) do the appropriate routines.
Does this answer your question?
-Dore

>Hi,
> Thank you. Any ways to raise an event or method inmediately when there are any string written in file? e.g
>
>DOS output from DOSAPP:
>Hello... && Call my Hello() inmediately
>bye... && Call Bye() inmediately..
>good luck
>
>Is it possible ?
>
>Thank you